What is the dark side of working at service based IT companies?

It has almost been 18 months since I have joined TCS. I was on the bench for a total of 5 months in the beginning, and finally got a project.

I went to the office and my manager told me that it would take few days for document verification and security clearance. I was coming to the office daily but had nothing to do. I was getting anxious since I was just watching Youtube videos for almost a month. I wanted WFH but when I asked they said I had to come to office even if I had no work.

Finally, I got a KT from someone working on the project. I came to realise that I was doing work that even a 9th class student can do. The problem? 5 people were doing this work.

The problem? I was working 30 minutes a day. I had to come early to the office, login using my seniors login creds and do timepass work. I have to send an email to our point of contact at the client side that the work is done at the end of the day.

I have learnt nothing here. I feel that these companies are just too inefficient. I am planning to leave ASAP now. I have learnt nothing and I am scared that I will not find another job because I have the Years of Experience but no skills. This is how IT companies destroy your career. Now I am doing DSA to get into another company.